It's curious to know if its gone or not, seems like a hard one to cure, they'd need to store which car the user has online, so once you change cars, the save file wouldn't be whats recording that. So when an older save is used/replaces the current save, that 'current car' data would have to remain the same (and not change to the car that you've just sent). Only way to be totally sure is to try to dupe it.
More importantly, I hope the multiple car sending per day, and the credit limit is taken off, that'd be a nice change.